Pressure-induced suppression of Jahn–Teller distortions and enhanced electronic properties in high-entropy oxide (Mg0.2Ni0.2Co0.2Zn0.2Cu0.2)O

Yan, Jiejuan; Zhang, Lingkong; Liu, Junxiu; Li, Nana; Tamura, Nobumichi; Chen, Bin; Lin, Yu; Mao, Wendy L.; Zhang, Hengzhong

doi:10.1063/5.0067432

Pressure-induced suppression of Jahn–Teller distortions and enhanced electronic properties in high-entropy oxide (Mg_0.2Ni_0.2Co_0.2Zn_0.2Cu_0.2)O

Journal Article · Mon Oct 11 00:00:00 EDT 2021 · Applied Physics Letters

DOI:https://doi.org/10.1063/5.0067432· OSTI ID:1882907

^[1]; Zhang, Lingkong ^[2]; Liu, Junxiu ^[2]; Li, Nana ^[2]; ^[3]; Chen, Bin ^[2]; ^[4]; Mao, Wendy L. ^[5]; ^[2]

Center for High Pressure Science and Technology Advanced Research (HPSTAR), Shanghai (China); Stanford Univ., CA (United States); SLAC
Center for High Pressure Science and Technology Advanced Research (HPSTAR), Shanghai (China)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Stanford Univ., CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)

Jahn–Teller distortions are often observed in Cu^II-containing complex oxides resulting in remarkable changes of physical properties. Tuning the Jahn–Teller distortions with pressure has attracted considerable interest but is less studied in Cu^II-containing high-entropy oxides (HEOs). We found that pressure can suppress the structural distortions originating from the Jahn–Teller effect of CuO₆ octahedra in the rock salt-type (Mg_0.2Ni_0.2Co_0.2Zn_0.2Cu_0.2)O HEO and significantly modify its electronic properties. Synchrotron x-ray diffraction shows that the structural distortions arising from the Jahn–Teller effect of CuO₆ octahedra are progressively suppressed, and the distorted structure evolves into a nearly ideal form under compression. Alternating current impedance and ultraviolet-visible absorption measurements reveal a dramatic resistance drop by more than three orders of magnitude and an obvious bandgap decrease in ~0.1 eV, respectively, accompanied by the pressure-induced suppression of structural distortions. Our study presents a promising route for tuning the structural distortions and the electronic structures of Cu^II-containing HEOs for optimizing materials functionalities.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: National Natural Science Foundation of China (NSFC); USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division

Grant/Contract Number:: AC02-05CH11231; AC02-76SF00515

OSTI ID:: 1882907

Alternate ID(s):: OSTI ID: 1895332

Journal Information:: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 15 Vol. 119; ISSN 0003-6951

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Pressure-induced suppression of Jahn–Teller distortions and enhanced electronic properties in high-entropy oxide (Mg0.2Ni0.2Co0.2Zn0.2Cu0.2)O

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Pressure-induced suppression of Jahn–Teller distortions and enhanced electronic properties in high-entropy oxide (Mg_0.2Ni_0.2Co_0.2Zn_0.2Cu_0.2)O